상세정보
학술지
Heterojunction Internal Photoemission of λ ∼ 2.8 μm by Ge/Si Core/Shell Nanowires
- 저자
- 서동우
- 발행일
- 201812
- 출처
- IEEE Transactions on Electron Devices, v.65 no.12, pp.5406-5411
- ISSN
- 0018-9383
- 출판사
- IEEE
- 협약과제
- 18VB1300, 고성능 비냉각 적외선 이미지 센서 개발 (본 과제명:메타구조 기반 비냉각 적외선 이미지 센서 개발), 서동우
- 초록
- The photodetector of Ge/Si core/shell nano-wires can detect 2.8- μm-long infrared, far beyond the absorption edge of both semiconductors, at room temperature. The device of single nanowire grown on heavily doped Si (111) shows typical rectifying behavior despite p-p isotype of nanowire and substrate. Under illumination, the present devices show large responsivity of 35 A/W at -0.5 V. The analysis of current-voltage characteristics shows that Ge/Si nanowire on p-type silicon device follows the model of semiconductor heterojunction rather than Schottky junction. This result implies that the interface between nanowire and substrate is the main barrier of charge transport in the present nanowire infrared detector. In this paper, the parameter values of the heterojunction of nanowire and substrate are quantitatively investigated with the thermionic transport model. The analysis of the energy band structure shows that even longer wavelength infrared can be detected through the photoemission of the holes over the reduced heterojunction barrier of 0.37 eV.
- KSP 제안 키워드
- Charge transport, Core/shell nanowires, Energy band structure, Even longer wavelength, Ge/Si core/shell, Heavily doped, Heterojunction barrier, Internal photoemission, P-p, Parameter values, Rectifying behavior